Ch. 4 Vocabulary – States of Matter
(p. 123, 11 terms + 7)
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States of Matter
Solid
Liquid
Gas
Plasma
Change of State
Melting
Evaporation
Boiling
Condensation
Sublimation
Atom
Molecule
Melting Point
Freezing
Freezing Point
Boiling Point
Condensation Point
Unit 2 (Ch.4) - Structure of Matter
Bach
10/05/09
Ch. 4 Vocabulary – States of Matter
(p. 123, 11 terms + 7)
1. States of Matter
The physical forms of matter, which include solid, liquid, and gas.
2. Solid
The state of matter in which the volume and shape of a substance are
fixed.
3. Liquid
The state of matter that has a definite volume but not a definite shape.
4. Gas
A form of matter that does not have a definite volume or shape.
5. Plasma
In physical science, a state of matter that starts as a gas and then
becomes ionized; it consists of free-moving ions and electrons, it
takes on an electric charge, and its properties differ from the
properties of a solid, liquid, or gas.
6. Change of State
The change of a substance from one physical state to another.
7. Melting
The change of state in which a solid becomes a liquid by adding heat.
8. Evaporation
The change of state from a liquid to a gas.
9. Boiling
The conversion of a liquid to a vapor when the vapor pressure of the
liquid equals the atmospheric pressure.
10. Condensation
The change of state from a gas to a liquid.
11. Sublimation
Unit 2 (Ch.4) - Structure of Matter
Bach
10/05/09
The process in which a solid changes directly into a gas.
12.Atom
The smallest unit of an element that maintains the properties of that
element.
13.Molecule
A group of atoms that are held together by chemical forces; a
molecule is the smallest unit of matter that can exist by itself and
retain all of a substance’s chemical properties.
14.Melting Point
The temperature at which a substance changes from a solid to a liquid.
(A physical property/ characteristic property used to identify
substances – melting point of water = 0°C).
15.Freezing
The change of state from a liquid to a solid.
16.Freezing Point
The temperature at which a liquid changes into a solid.
(A physical property/ characteristic property used to identify
substances – freezing point of water = 0°C).
17.Boiling Point
The temperature at which a liquid changes into a vapor, or gas.
(A physical property/ characteristic property used to identify
substances – boiling point of water = 100°C).
18.Condensation Point
The temperature at which a gas becomes a liquid.
(A physical property/ characteristic property used to identify
substances – condensation point of water = 100°C).
Grading Scale
(1 point per term)
A = 18 - 17
B = 16 - 15
C = 14 - 13
Unit 2 (Ch.4) - Structure of Matter
Bach
10/05/09
D = 12 - 11
F = 10 or less
Unit 2 (Ch.4) - Structure of Matter
Bach
10/05/09